I hadn't been using buffs or neck gaiters until I got this one in my ambassador pack. Turns out it is soo useful, especially in the winter. For my winter runs, I would put on a warm hat, but I would warm up and get sweaty very quickly and then have to carry around a hat. This is much better as it isn't as heavy and doesn't heat me up as much. Also, if it gets sweaty, I can just flip it around to the dry end.
With other gaiters covering my mouth and nose my glasses would fog up not with these. Definitely need more colors please.